hermann gmeiner school, faridabad...2) write the decimal expansion of following numbers and say what...

HERMANN GMEINER SCHOOL, FARIDABAD

SUMMER HOLIDAY HOMEWORK (2020 – 21)

SUBJECT: ENGLISH

CLASS –IX

Please Note:

· The assignments must be done in the English Notebook only. Please DO NOT

submit on loose sheets/files/folders

· The homework must be presented neatly and creatively.

Q1. Read newspaper daily and enhance your vocabulary.

Q2. Based on the new stories/poems/articles that you read over the next few weeks

of your summer break, design a word puzzle, comprising a minimum of 15 words. It

can be a crossword, a Jumbled word game, a word search or anything related. The

game must provide interesting clues/instruction to the readers to help them figure out

the correct answer.

Q3. Even an educated person sometimes realises the existence ofaghost. As

Mahendra( FromIswaran the Story Teller),writea letter to your younger brother

narrating your encounter with the ghost that night.

Q4. Read the chapter (The Adventures of Toto) and answer the following questions:-

A.Themeaningoftheword'wrenched'is.......................

B.Theantonymoftheword'apparent'is.........................

C.Toto was bought by the grandfather because he was red in colour.True/False

D.The ticket collector didn't charge ticket for the

tortoisebecause....................................................

E.Toto couldn't be kept with other animals in the private zoo

because.......................................

F.When Toto shredded the narrator's coat to

pieces,thegrandfathercommentedthatToto was........................

G.The grandfather sold the monkey only because he was pestering his

relatives.True/False

Suggested Reading-

-Swami and Friends by R. K. Narayan

- The Blue Umbrella by Ruskin Bond



SUBJECT: HINDI

CLASS –IX

नोट :इसकारयकोअपनीकारयपसतिकामसफाईसकर।पाठरकरमकोदोहरािरह।अबिकजोभीकारयपसिकादीगईहउनसभीकारयपसिकाओकोपराकर।

पर1. पाठ -1 दोबलोकीकथा :-

हीराऔरमोिीनशोषणकसिलाफआवाजउठाईलसकनउसकसलएपरिाडनाभीसही।हीराऔरमोिीकीइसपरसिसकररापरिकय ससहिअपनसवचारपरकटकर। (100

स 150शबदोम )

अथवा

ललदयदकशमीरीकवसरिीह।कशमीरपरसचिससहिअनचछदसलसिए।

पर2. पाठ- 1 (दोबलोकीकथा)औरपाठ -2 (लहासाकीओर)

मआएउपसगयऔरपरतररवालशबदोकोछााटकरसलसिएिथाउनमसमलशबदोकाअलगकीसजए।(कारयए - 4 साएजशीटपर)

जस:-

पर3. 'िोदापहाडसनकलीचसहरा' परएकमौसलककहानीसलिो।

पर4. आजकलवािावरणऐसाबनगराहसकअपराधीमनषरअपराधकरनकबादघबरािा,

कषमाराचनानहीकरिाबसलकउलटाधमकािाभीह।अिःउलटाचोरकोिवालकोडाटककथनकआधारपरएककहानीसलसिए।

पर5. तवतरजीवनकलाभ' परअनचछदसलसिए।

पर6 . सचिकोदिकरऔरिऔरराजाकमधरसवादसलसिएl ( कारयए - 4 साएजशीटपरकर )

अथवा

रकषाबधनकोलकरभाईऔरबहनकमधरसवादसहसचिसलसिए।

पर7.वकषसचिदवाराभदउदाहरणससहिसलिो। (कारयए - 4 साएजशीटपरकर )



SUBJECT: MATHS

CLASS –IX

ACTIVITIES

1) Make a chart of formulae and properties of all chapters. 2) Do the given assignments in your notebook. 3) Complete notebooks. 4) Learn square and square roots upto 20. 5) Prepare a special chart of number system:

a) Natural number b) Whole number c) Integers d) Rational and irrational numbers

e) Real numbers 6) Write an autobiography of mathematicians in A3 size sheet.

NUMBER SYSTEM 1) Find 2 rational numbers between 1/3 and ¼ and arrange in ascending order.

2) Write the decimal expansion of following numbers and say what kind of decimal

expansion each has

a) 0.075 b) 23.7812 c) 2/11 d) 229/400

3) Express the following numbers in the form of p/q , p & q are integers, q≠0

a) 0.6 b) 0.47 c) 0.001

4) Locate √3 on number line.

5) Add ( 2 + 5√3) and (-7-5√3)

6) Simplify 3√3 + 2√27 + 7/ √3

7) Simplify √24/8 + √54/9

8) Rationalize the denominator of the following:

a) 16/(√41 – 5) b) (7+3√5)/ (7-3√5)

9) Find a and b if √2+√3

3√2− 2√3 = a - b√6

10) Simplify

a) 71/5 / 71/3 b) (81/16)-3/4

POLYNOMIALS

1) Write the coefficients of x2 in each of the following: a) 2 – x2 + x3 b) Π/2 x2 +x

2) For the polynomial (x3 + 2x +1)/5 – 7/ 2 x2 – x6 , write

a) Degree of the polynomial

b) The coefficient of x3

c) The coefficient of x6

d) The constant term.

3) Find p(0), p(1) and p(2) for each of the following polynomials: a) p(y)=y2−y+1 b) p(x)=(x−1)(x+1)

4) If f(x) = x3+3x2+3x+1 , find f(2) + f(-2) + f(0)

5) Find zeroes of the following polynomials

a) 2x+3 b) ax +b , a≠0

6) Determine which of the following polynomials has (x + 1) a factor:

(i) x3+x2+x+1

(ii) x4 + x3 + x2 + x + 1

7) Factorise the following polynomials:

i) X2 + 9x + 18

ii) Y2 – 3y - 54

(iii) 6x2+5x-6

(iv) 3x2 – x – 4

8) Using appropriate identities, find the following products:

a) (x-4)(x+5) b) (y2 + 3/5) (y2 – 3/5)

c) 105× 108 d) (96)2

9) simplify ( 2a+3b)3 – ( 2a – 3b)3

10) if a+ b +c = 0, ab +bc + ca = 26

Then find a2+b2+c2

CO-ORDINATE GEOMETRY

1) Without plotting the points indicate the Quadrant, they will lie,if

a) Ordinate is 5 and abscissa is -3.

b) Abscissa is -5 and ordinate is -3.

c) Abscissa is -5 and ordinate is 3.

d) Ordinate is 5 and abscissa is 3.

2) Plot the points P(-3,4). Draw PM and PN perpendicular to x- axis and y-axis respectively, state the coordinate of the points M and N.

3) Plot the points A(1,2) , B(2,-1) and C(-1,4) and check whether they are collinear or not.

4) Plot the points A(1,2) , B(-4,2), C(-4,-1) and D(1,-1). What kind of Quadrilateral is ABCD.

5) Plot the points (-3,0), (5,0) and (0,4) on Cartesian plane, Name the figure formed by joining these points and find its area.

LINEAR EQUATION IN 2 VARIABLES

1) Express the following linear equation in the form ax+by+c=0 and write the values of a,b and c in each case:

a) 3x = √2y -5

b) 2x = -5y

c) 2y = 5/7

2) Write four solutions of the following linear equation:

a) √2x +y = 5

b) X+2y = 6. Also draw their graphs.

3) For what value of K the linear equation 2x +ky = 8 has (2,1) as its solution? If x=4, then find the value of y?

4) Write the equation x/2 +3y/5 = -1 in the standard form.

5) Draw the graphs of the equations 3x +4y = 7 and 3x – 2y = 1 and find the point of intersection of the lines representing the equations.

LINES AND ANGLES

1) In Fig. 6.29, if AB || CD, CD || EF and y : z = 3 : 7, find x.

2) In Fig. 6.31, if PQ || ST, ∠PQR = 110° and ∠RST = 130°, find ∠QRS.

3) In Fig. 6.32, if AB || CD, ∠APQ = 50° and ∠PRD = 127°, find x and y.

4) In Fig. 6.40, ∠X = 62°, ∠XYZ = 54°. If YO and ZO are the bisectors of ∠XYZ and ∠XZY respectively of Δ XYZ, find ∠OZY and ∠YOZ.

5) In Fig. 6.44, the side QR of ΔPQR is produced to a point S. If the bisectors of

∠PQR and ∠PRS meet at point T, then prove that ∠QTR = 1/2∠QPR.



SUBJECT: SCIENCE

CLASS –IX

Happy holidays students. Take care of your health. Have lots of water and fruits. Avoid junk food. Stay at home and wash your hands frequently. Apart from all these you have to do the following 1) Learn all the lessons of Pre- Mid Term (Taught in the class.)

Lesson 1 Matter in our surroundings Lesson 5 Fundamental unit of life Lesson 8 Motion Lesson 6 Tissue Complete your notebook.

2) Make a project of spreading awareness on safety measures taken at this time of corona virus pandemic through PPT or charts 3) Prepare a PPT on lesson Matter in our surroundings...

4) Plan to go to a place by vehicle. Take readings of odometer and speedometer after every 5 minutes till you reach your destination Record these observations in

tabular form. Plot graphs between distance – time and speed time. State whether this motion uniform or non- uniform motion.

5) Make a report on genetic engineering including; ¾ information on gene cloning. ¾ what is bio- technology. ¾ application of bio- technology.

Or

Make a project report on biofuel, including ¾ what is biofuel. ¾ How they are made? ¾ pros and cons of biofuel.



SUBJECT: SOCIAL SCIENCE

CLASS –IX

I) PREPARE A PROJECT ON (ANY -1 ) OF THE FOLLOWING TOPICS:

a. COVID 19

b. Relief features of Earth /Geographical condition of the earth.

c. Future World War-III

( important points - number of pages 15-20, illustrated with help of maps, pictures

and diagrams , bind your project in a folder or File OR prepare PPT )

II) Prepare chart or on A3 size sheet on the following:( Any -2)

a. 1947-2020 Prepare list of prime minister and president along with their

information)

b. Constitution:- Preamble, leaders, B. R. Ambedkar, National symbols etc.

c. REAL FACTS –About geography,history and economics.

III) Revise the covered syllabus.



SUBJECT: INFORMATION TECHNOLOGY

CLASS –IX

Instruction :- Do this assignment in your IT notebook with heading holidays Homework. (2020-21)

1) Learn and revise all assignments and worksheets .

2) What is internet? Give advantages and disadvantages of computer.

3) Explain use of operating system? Give some example of OS.

4) Explain GUI in window operating system?

5) Explain database program. Write the name of at least three database

software?

6) Which software allow us to view all the files and folders which are

saved in a computer.

7) Write all the options of File Menu option.

8) In which menu options cut and copy options are available?

9) Draw the diagram of computer network and network topology on A3

sheet or chart.

10) Write a short notes on the different services available on the Internet,

like E-commerce, E-governance, E-shopping, E-mail, Ebanking, etc.

11) Project: Make a project MS-word on the given topic and submit on E-

mail ID with your name ,class,section mail id:

[email protected]

1. Create table and write down your daily routine work and study time.

2. Make your bio-data with your hobby.

Or

Make a invitation letter for Birthday party of your younger sister.



SUBJECT: ENGLISH

CLASS –X

NOTE--Do the given work in your class note book neatly. Read any novel of

your choice to develop reading habit.

1.You intend to join coaching classes at International Coaching Center situated in Raipur. The

institute specializes in teaching science to classes XI – XII. Write a letter of inquiry in 100-120 words

addressed to the Administrator in charge of the institute seeking clarification about the timings,

duration, staff, transport and other necessary details for joining the institute. You are Rajesh/Rajni 2,

Library Road Jabalpur.

2.You are Tanmay /Tanisha living in house no.15 B, Ashok Nagar Delhi. Write a letter to the manager

of Gupta Sports, New Delhi placing an order for sports items for your school team.

STORY WRITING TIPS

As story writing involves creative writing skills, please follow the below mentioned points to

write a good story -

1. The narrative should be in Ist or IInd or IIIrd person.

2. Setting of the story should be made.

3. Time, location, context and atmosphere should be described to create imagery.

4. Meaningful dialogues to be used. Dialogues should have expressions.

5. Characterization - identify 2 - 3 main characters and a few side characters in the story.

6. Plot of the story should be interesting but short because the word limit should not be

exceeded. It can include the following –

Points

1. What happens

2. Story line

3. Action

4. Flashback

5. Climax

6. Conflict

7. Resolving a conflict

8. Create conflict and tension

9. Opposition between characters and their internal or external conditions

10. Balance b/w opposing forces of the conflict

11. Mystery

12. Empowerment

13. Surprise

14. Empathy

15. Crisis or climax

16. Turning point of the story

17. Resolution or solution to the conflict

18. Open type- reader’s view

19. Resolved – clear cut outcome

20. Parallel to beginning- same as the starting of the story

21. Monologue / dialogue of the characters

22. Closing image

Marking Scheme for short story writing-

Title & Moral - 1 Mark

Content - 4 Marks

Expression - 5 Marks (Coherence, relevance of ideas) (2½ marks) (Accuracy, appropriate

words and correct spellings (2½ marks)

Suggested value points: (The beginning of the story is given in the question)

Story Writing

3. Write a short story in 200 – 250 words, with the help of the clues given below. Give a

suitable title to the

story. Going to

Mumbai by train to attend the marriage of a friend ..... got stuck in a traffic jam ..... reached

the railway station late ..... boarded a wrong train ..... realised after two hours ..... now you ...

... ..

4. Write a short story in 200 – 250 words, with the help of the cues given below. Give a

suitable title to the

story.

Satish was standing on the balcony watching the last rays of the Sun. Loud and angry

voices in the street below distracted his attention. He ran down the stairs to see what had

happened ... …

5.The following passages have not been edited. There is one error in each line. Write the

incorrect word and the correction against the correct question number in your answer

sheet.

Vitamin tablets has been around forever, but antioxidants are the a) …………………….

the last miracle cure. Do they really work? b) …………………….

If the hype is true, then that the antioxidants do is c) …………………….

work for neutralise the free radicals in our bodies d) …………………….

and latter excrete them. Free radicals are atoms or molecules e) …………………..

that have at least one unpaired electron and is therefore f) ……………………

unstable and highly reactive. In animal tissue they are believing to accelerate the g) ……………………

progression of cardiovascular and age-related diseases as dementia and cancer. h) …………………..

6.

The use for bottled supplements with your diet is a practice a) ……………………

that need to be discouraged. It is also essential to keep abreast b) …………………..

off new developments in research. Ironically those health-conscious individuals c) …………………….

who already eats large quantities of fresh fruit and vegetables, d) …………………….

who diet does not include junk food and who get plenty of regular e) …………………….

exercise and have least need for dietary supplements tend to be the ones f) ………………………

whom are most likely to use them. g) …………………….

7. LITERATURE

Answer the following questions.

1.Who actually helped the pilot of Dakota to land safely in spite of no support from control room

,radio, compass and enough fuel?

2.What is the difference in the activities of a tiger in a cage or a tiger in forest? Answer in the

reference of the poem A Tiger in the Zoo.

3.What were the different tasks given to Anne Frank by her Math’s teacher as punishment?

4.Why did Hari Singh come back to Anil’s house from the railway station?

5.What was the role of surgery in Tricki’s life?

6.What were the ideals of Freedom according to Nelson Mandela?



SUBJECT: HINDI

CLASS –X

नोट :रह। दोहराि को पाठरकरम कर। स सफाई म कारयपसतिका अलग एक को कारय इस अब िक जो

भी कारयपसिका दी गई ह उन सभी कारयपसिकाओ को परा कर।

पर1. सनमनसलसिि सवषरो पर सवजञापन बनाइए- (ए-4 साइज शीट पर)

कोरोना : एक महामारी

अपसरा पससल

दि परकाश टथ पतट

पर2. घटना वणयन—जब म डरा/ डरी...........अपन जीवन स जडी सकसी घटना क बार

म सलसिए।(कारयपसतिका म कर)

पर3. सहदी सासहतर की सनमनसलसिि कहानी और कसविाओ को पढकर उसक भावाथय को अपन शबदो

म सलसिए।

निाजी का चशमा, बालगोसवद भगि

सरदास, िलसीदास

मािा का आाचल, जॉजय पचम की नाक

पर4. सजञा , सवयनाम और सवशषण क भदो को उदाहरण ससहि सलिो। (ए-4 साइज

शीट पर)

उदाहरण :-



SUBJECT: MATHS

CLASS –X

Real Numbers

Q 1. Find the HCF of 1260 and 7344 using Euclid’s algorithm.

Q 2 The HCF of 65 and 117 is expressible in the form 65m – 117. Find the value

of m. Also find the LCM of 65 and 117 using prime factorization method.

Q 3. Express 429 as a product of its prime factors.

Q 4. Determine the values of m and n, so that the prime factorization of 10500

is expressible as 2m x 3 x 5n x 7

Q 5. Find the largest number which divides 70 and 125 leaving remainders 5

and 8 respectively.

Q 6. Find the LCM and HCF of the following integers by applying the prime

factorization method 12, 15 and 21.

-----------------------------------------------------------------------------------------------------------

------

Polynomials

Q 1. If 1 is a zero of polynomial, P(x) = ax2 - 3(a-1) - 1, find value of a.

Q 2. If α and β are zeroes of a quadratic polynomial, 2x2 - 5x + 3,

find 1

α +

1

β

Q 3. Find a quadratic polynomial whose zeroes are (3+√2) and (3-+√2).

Q 4. If two zeroes of a polynomial,

P(x) = x3 - 4x2 - 3x + 12, are + √3 and − √3, Find its third

zero.

Q 5. If the zeroes of the polynomial x3 - 3x2 + x + 1 are (a-b), a and (a+b).

Find a and b.

Q 6. If the polynomial 6x4 + 8x3 + 17x2 + 21x + 7 is divided by another

polynomial 3x2 + 4x + 1, the remainder comes out to be (ax +b), find a

and b.

Q 7. Find the zeroes of the following quadratic polynomials and verify the

relationship between the zeroes and the coefficients.

i) 2x2 - 9 - 3x, ii) 4u2 + 8u iii) 4x2 - 3x - 1

Q 8. Obtain all the zeroes of the polynomial, x4 + 4x3 - 2x2 - 20x - 15, if two

of its zeroes are √5 and −√5 .

---------------------------------------------------------------------------------------------------------

---

Linear Equations in two variables

Q 1. If 7x = 9y = 42 and 9x + 7y = 22, find value of x + y.

Q 2. In the given fig., find x and y. D 7 C

5 x-y

A x-3y B

Q 3. The angles of a triangle are x, y and 400. The difference between the two

angles x and y is 300, find x and y.

Q 4. For which value of k will the following pair of linear equations have no

solution,

3x + y = 1

(2k-1)x + (k-1)y = 2k + 1

Q 5. Solve,

43x + 67y = -24 and 67x + 43y = 24.

Q 6. Solve the following pair of linear equations graphically,

x + 3y = 6

2x - b3y = 12

Also, find the area of the triangle formed by the lines representing the

given equations with the y-axis.

Q 7. Two years ago, Salim was thrice as old as his daughter and six years later,

he will be four years older than twice her age. How old are they now?

Q 8. Solve for x and y:

3x + 5y = 12

3x - 5y + 18 = 0 (use any method)

Q 9. Solve using cross multiplication method:

2x = 5y + 4

3x - 2y + 16 = 0

Q 10. For what values of a and b will the following system of linear equations

has infinitely many solutions?

2x - 3y = 7

(a+b)x - (a+b-3)y = 4a + b

---------------------------------------------------------------------------------------------------------

---

Quadratic Equations

Q 1. If 1 is a root of equation,

ay2 + ay + 3 = 0

and y2 + y + b = 0, find a and b.

Q 2. Which of the following equations has two distinct real roots?

i) 2x2 - 3√2x + 9

4 = 0

ii) 5x2 - 3x + 1 = 0

iii) x2 + 3x + 2√2 = 0

Q 3. Solve the following equation:

1

𝑥 −

1

𝑥−2 = 3, x ≠ 0, 2

Q 4. Find the value of k for which the equation x2 - 4x + k = 0, has distinct

real roots.

Q 5. Find the nature of roots of the quadratic equation:

√2 x2 - 3

√2𝑥 +

1

√2 = 0

Q 6. If x =2

3 and x = -3 are the roots of the quadratic equation

ax2 + 7x + b, find the value of a and b.

Q 7. Solve for x: 2x2 - 5x + 3 = 0

Q 8. Solve for x: 8x2 - 8√2x + 4 = 0

Q 9. The sum of two numbers is 9 and the sum of their reciprocals is 𝟏

𝟐. Find the

numbers.

Q 10. The sum of the squares of two consecutive natural numbers is 421, find

the numbers.

Q 11. The hypotenuse of right-angled triangle is 6 cm more than twice its

shortest side. If third side is 2 cm less than hypotenuse, find the sides of

this triangle.

Q 12. Solve for x :

𝟏

𝐚+𝐛+𝐱 =

𝟏

𝐚 +

𝟏

𝐛 +

𝟏

𝐱

Q 13. Find the value of p for which the roots of the equation

px(x-2) + 6 = 0 are equal

-------------------------------------------------------------------------------------------------

Coordinate Geometry

Q 1. The point which divides the line segment joining the points, (8,-9) and

(2,3) in ratio 1:2 internally lies in the

a) I quadrant b) II quadrant c) III quadrant d) IV quadrant

Q 2. Find the distance of the point p(-3,4) from the x-axis.

Q 3. If A(m/3, 5) is the mid-point of line segment joining the points Q(-6,7)

and R(-2,3), find the value of m.

Q 4. Prove that the points A(7,-2), B(2,3) and C(-1,6) are collinear.

Q 5. If the point P(x,y) is equidistant from the points A(5,1) and B(-1,5), show

that 3x = 2y.

Q 6. Find the area of the quadrilateral whose vertices taken in order are

(-4,-2), (-3,-5), (3,-2) and (2,3).

Q 7. If the points A(4,3) and B(x,5) are on the circle with center O(2,3), find the

value of x.

Q 8. Find the ratio in which point P(-1,y) lying on the line segment joining

points A(-3,10) and B(6,-8) divides it. Find the value of y also.

Q 9. For the triangle ABC, formed by the points A(4,-6), B(3,-2) and C(5,2),

verify that median divides the triangle into two triangles of equal area.

-----------------------------------------------------------------------------------------------

------------------

Perform the followingActivities

1. Prove Pythagoras Theorem

2. Make a short note of Quadratic Formulae

3. Prepare a special chart of Number system

i. Natural numbers

ii. Whole numbers

iii. Integers

iv. Prime numbers

v. Composite numbers

vi. Rational and Irrational numbers

vii. Real numbers

4. Contribution of Indian mathematician, Shri Dhracharya

NB:- Complete your notebooks and practice whatever has been

taught till now.



SUBJECT: SCIENCE

CLASS –X

Happy holidays students. Take care of your health have lots of water and fruits. Avoid junk

food. Stay at home and wash your hands frequently. Apart from all these you have to do

the following

1. Write all NCERT exercise and exemplar question answers of the following

chapters in your notebook.

(I) Chemical Reactions and Equations

(II) Acid,base and salt

(III) Life Process

2. Learn all answers of the chapters taught

3. Complete all worksheets given in the month of April and May

4.Practice question bank of chapter Life Process.



SUBJECT: SOCIAL STUDIES

CLASS –X

I) LABLE ON THE POLITICAL MAP OF INDIA WITH THE FOLLOWING PLACES

A. Movement of Indigo planters – Champaran

B. kheda related to peasant satyagrah – Gujarat

C. Centre of cotton mill workers- Ahmadabad

D. jalliawala bagh incident took place- Amritsar

E. calling off Non cooperation movement- Chauri chaura

F. place where civil disobedience movement started – Dandi

G. Indian National congress sessions

Calcutta session (sept 1920)

Nagpur session (dec 1920)

Madras (1927)

Lahore session (1929)

II) PREPARE A PROJECT ON ANY ONE OF THE FOLLOWING TOPICS:

A. Tsunami

B. Safer constructive practices

C. Consumer protection

( important points - number of pages 15-20, illustrated with help of maps,

pictures and diagrams , bind your project in a folder )

III) Revise the covered syllabus.



SUBJECT: INFORMATION TECHNOLOGY

CLASS –X

Prepare a transparent Practical file:

Design a cover page starting your School Name, Subject code, your name, Class, Roll number and Section.

Solve the following question in Ms-word and write the steps, also paste screenshots.

Q1. Insert Header as Information Technology and Footer as Page nos. in your

document.

Q2. Write 4 paragraphs from your English book and align the paragraphs left,

right, center

and justify.

Q3. Insert 2 images in your document, one from clipart and another from file.

Q4. Insert and Excel file in your word document. (Using insert -> object)

Q5. Insert 4 different shapes of your choice and place text in shapes.



SUBJECT: PSYCHOLOGY

CLASS –XII

1. Make a file on case study done on an individual having any type of psychological disorders or have

done extremely good in his/her field as per the pattern given in the NCERT book for the final

practical examination

2. Revise and make revision notes of all the chapter done in the class.

3. Complete the pending assignments

4. Watch any movie based on psychological disorder and write your views and feelings about it.

ENGLISH

Class XII A, B, C,

Q1. Write five each in your note-book.

(i) Notice (ii) Note-making

(iii) Unseen Passage (iv) Advertisements

(v) letter writing (vI)

Q2. Read the editorial section of any English newspaper and write your comments on it.

Q3. Collect at least 10 articles on current topics, read and paste in your notebook.

Q4. Read all the chapters done in the month of April and may, write the summary and question &

answers.

Q5. Make a video of yourself reciting the two poems.

Q6. Make your resume ,five years from now ie 2025.



SUBJECT: PHYSICAL EDUCATION

CLASS –XII

• Complete the notebook,unit 1-10 according to pdf.

• Make the project of any one game

• Volleyball

• Football

• Sketing

• Revise the numerical portion.

It’s necessary to complete your holiday Homework.



SUBJECT: PAINTING

CLASS –XII

Prepare paintings for final CBSE practical exams 2020-21

1. Landscape drawings:

- One in colour

- One in pencil

- One in black gelpen

2. Still life( object)

- One in colour

- One in pencil

3. Geometrical shape composition

- One in colour

- One in colour

- One in black and white

4. Any traditional painting e.g. Madhubani, Warlirajasthani etc.

- One in colour

5. Painting on different topics like:

- Market scene, Scene at village well, etc

Total 11 work

* Rest of the paintings will be made after holidays

* Maximum 20 paintings will be made



SUBJECT: POLITICAL SCIENCE

CLASS –XII

! ) PREPARE POWER POINT ON THE TOPICS MENTION BELOW:

YOU ARE FREE TO CHOOSE ANY TOPIC FROM HERE

A) COLD WAR -2 USA AND CHINA

B) CHINA – THE NEXT SUPER POWER

C) SYRIAN CIVIL WAR

D) CRISIS VENENZUELA

E) LIFE AFTER DISINTEGRATION – Post Soviet Republic

F) US – China Trade War

G) Brexit

H) Migration ------ Refugees crisis

I) Impact of corona virus – vulnerable developed world

J) South China Sea

K) Role of regional parties

L) Relevance of NAN and SAARC

M) Separatist movement – Kashmir

N) Article 370 Revoked

O) One Part Dominance ----------- BJP Post 2014

P) India’s Relations with its Neighbors .

Q) Gun Culture in the western world

R) Brics

S) Arab Spring

T) Middle East Crisis

U) Afghanistan crisis

V) Change in India’s foreign Policy

W) Globalization

X) Sreps Taken to conserve Environment Pollution ( causes n consequences also include )

Y) Global Warming

Z) India Pakistan relations from !947 to 2020 …

A ) Kashmir problem after revoked of article 370 .



SUBJECT: HINDI

CLASS –XII

1.Revise all syllabus which we have completed.

2.Make your project according to instructions.

3.Do practise daily unseen passage.

4.Read two pages daily from your chapters.



SUBJECT: ECONOMICS

CLASS –XII

Prepare project out of following topics as per instructions

GREEN REVOLUTION

ORGANIC FARMING

CENTRAL BANK

BRITISH GOVT AND INDIAN ECONOMY

GOVT BUDGET

RURAL DEVELOPMENT

POVERTY IN INDIA

UNEMPLOYMENT IN INDIA

SUSTAINABLE DEVELOPMENT IN INDIA

INDIA PAKISTAN AND CHINA DEVELOPMENT EXPERIENCE

GOODS AND SERVICES TAX

DEMONITISATION

COVID 19 AND INDIAN ECONOMY

Prepare file with research work atleast 20 pages with proper certificate/

introduction/bibiliography/relevant photos and your opinion and recommendation on topic selected



SUBJECT: BUSINESS STUDIES

CLASS –XII

PART A:

- Revise ch- 1, 2,11

- Learn and practice Assignments, MCQ's, Case studies, long question's Answers.

- practice these chapters from 5 sample papers/ Board's question papers.

PART B :

Prepare project file on any one Topics given below:

1. Marketing Management

2. Business Environment

3. Principles of management by Henry Fayol

Or

Principles of scientific management by F.W.Taylor.

4. Stock Exchange

Note: Go through guidelines of CBSE relating to Business Studies projects



SUBJECT: ACCOUNTANCY

CLASS –XII

1. Complete all the worksheets( 1 to 12) in class notebook and on MS Excel.

2. Revise all the formats from all the chapters.

3. Do 10 practical questions from each chapter.

a. Fundamentals of partnership.

b. Treatment of goodwill

c. Change in profit sharing ratio

d. Admission of a new partner

4. Study Chapter- Retirement/death of a partner.



SUBJECT: IP

CLASS –XII

Q1. What is difference between Compiler and Interpreter?

Q2. Write a program in python print string

I

N

F

O

R

M

Q3. Give the output of the following operation :-

X = True

Y = False

print (‘x and y is’, x and y)

print (‘x or y is ‘, x or y)

print (‘not x is ‘, not x)

Q4. Give an example of membership operator and Identity operator separately.

Q5. Difference between Indexing and Slicing. Explain with an example.

Q6. Explain 2-D array in numpy with an example.

Q7. How to create 2-D array from 1-D array.

Q8. Give the output of the code.

importnumpy as np

b=np.array([[6,5,8],[4,2,6]])

print(b)

Output=?

Q9. Give output of the following code.

importnumpy as np

a=np.array([[6.323,8.232],[5.572,9.112,9.119]])

print(np.power(a,2))

print(np.floor(a))

O/P=?

Q10. Give an example of 2-D array with around function.

Q11. What do you mean by 2-D array covariance? Write formula and implement it.

Q12. What do you mean by 2-D array correlation? Explain with example.

Q13. Create an empty series in Pandas.

Q14. Explain data structure in Pandas.

Q15. Write the output of the code

import pandas as pd

importnumpy as np

data =‘a’:0, ‘b’:1, ‘c’:2

s=pd.series (data)

print (s)

output=?

Q16. Write the output of the code

import pandas as pd

importnumpy as np

data =‘a’:0, ‘b’:1, ‘c’:2

s=pd.series (data, index = [‘b’, ’c ’,’d’, ‘a’])

print(s)

output =?

Q17. Write the code of given output

0 5

1 5

2 5

3 5

dtype: int 64

Q18. How many type of numpy array explain?

Q19. Explain the pandas data frame.

Q20. How to create empty data frame?5. Complete project file for your final practical

exam(material will be given to you by the teacher in due time).



SUBJECT: CS

CLASS –XII

Q1. What is difference between Interactive mode and Script mode?

Q2. Write the syntax of your name print.

Q3. Give the output of this operation :-

X = 5

Y = 4

Print (‘X +Y =’, X +Y)

Print (‘x//y=’, x //y)

Print (‘x **y= ‘, x**y)

Q4. Write a program to input any number and to find reverse of that number.

Q5. Write the output from the following code

(i) sum = 0

for i in range (2, 20, 3):

sum + = i

print (“sum =”, sum)

output = ?

(ii) sum = 0

i= 5

while (i<=20):

sum+=i

i+=5

print(“sum =” sum)

output =?

Q6. Write the Application of queue.

Q7-Write a program in python convert the Temperature into Fahrenheit from user input.

Q8. Write a program in python cheek Armstrong number.

153=1*1*1+5*5*5+3*3*3

Q9. Write for statement to print the series 10, 20, 30,…….300.

Q10. Write the while loop to print the series 5, 10, 15,……..100.

Q11. What are the logical operators of python?

Q12. What is the difference between ‘/’ and ‘//’?

Q13. def (sum x,y):

z=x+ y

return z

define formal argument in this code.

Q14. What is lambda function? Explain with an example.

Q15. What is difference between mutable and immutable data objects with respect to

function.

Q16. What is use of mathematical function in Python.

(a) ceil(n) (b) factorial(n) (c) floor(n) (d) fmod(x, y) (e) pow(x, y) (f) e

Q17. Write the algorithm for binary search using recursion.

Q18. Why you use binary search.

Q19. Explain primitive and non-primitive data structure.

Q20. Python Program to find the factors of a number.

Q21. Python program to find the L.C.M. of two input number.

Q22. Python program to find H.C.F of two numbers. Q23.Python Program to find the factors of a number. Q24. Python program to find Factorial of a number using recursion. Q25. Function to find HCF the Using Euclidian algorithm

Hints: We divide the greater by smaller and take the remainder. Now, divide the smaller by this remainder. Repeat until the remainder is 0. Example- if we want to find the H.C.F. of 54 and 24, we divide 54 by 24. The remainder is 6. Now, we divide 24 by 6 and the remainder is 0. Hence, 6 is the required H.C.F.



SUBJECT: MATHS

CLASS –XII

From NCERT PART-1:

CHAPTER 1- Ex 1.1 (Q. No.2,4,5,8,9), Ex 1.2(Q. N.3,4,5,6,10), Ex 1.3(Q No. 3 to8) , Ex 1.4(Q.

No 11).

CHAPTER 2 –Learn all the principal value branch and properties of all inverse trigonometric

function, Ex 2.1(Q1 t0 14), Ex 2.2(Q 1 to 16), Miscellaneous Example (9 to 13).

CHAPTER:3- EXERCISE 3.4 (Q.No 15,16,17), Miscellaneous Exercise (Q No 1 to 11).

CHAPTER:4- EXERCISE 4.2(Q .No. 10,12,13,14), EXERCISE 4.6(Q.NO. 13,15,16)

CHAPTER:12- EXERCISE 12.2(Q.NO. 2 to 10), MISCELLANEOUS EXERCISE(Q.NO. 3,5,6,10)

MISCELLANEOUS EXAMPLE(Q.NO. 9,10,11)

From NCERT PART-2:

*On Page No. 290-291: REVISE ALL THE DERIVATIVES , INTEGRALS FORMULAE and ALSO

WRITE THE SAME IN A NOTEBOOK (20-25 PAGES)

* REMIND ALL THE TRIGONOMETRIC FUNCTIONS FORMULAE FROM XI NCERT

POWER POINT PRESENTATION GROUPWISE ON EITHER OF THE TOPICS: VECTORS, 3D

GEOMETRY, CONTINUITY & DIFFERENTIABILITY, INVERSE TRIGONOMETRIC FUNCTIONS,

PROBABILITY, RELATIONS& FUNCTIONS.

Complete and Revise Chapter 1, 2, 3, 4 and 12 in fair notebook.



SUBJECT: PAINTING

CLASS –XII

Holiday homework for Class XII Prepare Paintings for final cbse Practical exams 2020-21 1. Landscapes : 3 Paintings ( 1. In colour, 1. In pencil, 1. In black gel pen) 2. Still life ( objects ) : 2 Paintings ( 1in colour, 1 in pencil) 3. Geometrical Shapes Composition. : 2. ( 1 in colour, 1 in black & white ) 4. Any traditional Painting: 1 ( Madhubani ,warli or Rajasthani ) 5. Paintings on topics like ,Market scene, village well scene, vegitable market, bus station scene etc :

2 Paintings in colour Rest of the Paintings will be made after holidays. Maximum 20 Paintings will be made for cbse portfolio.



SUBJECT: PHYSICAL EDUCATION

CLASS –XII

Revise the unit 1 to 10.

Completethenotebook,unit 1-10 according to pdf.

Make the project of any one game Volleyball

Football

Sketing

Revise the numerical portion.

It’s necessary to complete your holIday homework.



SUBJECT: CHEMISTRY

CLASS –XII

Happy holidays students. Take care of your health ,have lots of water and fruits.

Avoid junk food. Stay at home and wash your hands frequently. Apart from all these

you have to do the following -:

ASSERTION -REASON TYPE Q1- A statement of assertion is followed by a statement of reason. Mark the correctchoice from the options given below: (a) Both assertion and reason are true and reason is the correct explanation of assertion. (b) Both assertion and reason are true but reason is not the correct explanation of assertion. (c) Assertion is true but reason is false. (d) Both assertion and reason are false. 1. Assertion : In an ideal solution, Δmix H is zero. Reason : In an ideal solution, A - B interactions are lower than A-A and B-B interactions. 2. Assertion : Osmosis does not take place in two isotonic solutions separated by semi-permeable membrane. Reason : Isotonic solutions have same osmotic pressure. 3. Assertion : Lowering of vapour pressure is not dependent on the number of species present in the solution. Reason : Lowering of vapour pressure and relative lowering of vapour pressure are colligative properties. 4. Assertion : 1 M solution of KCl has greater osmotic pressure than 1 M solution of glucose at same temperature. Reason : In solution KCl dissociates to produce more number of particles. 5. Assertion : Two liquids nitric acid and water form a maximum boiling azeotrope when mixed in the ratio of 68% and 32% respectively. Reason : Interaction between nitric acid and water are stronger than nitric acid - nitric acid interactions and water - water interactions. Q2-A statement of assertion is followed by a statement of reason. Mark the correctchoice from the options given below:

(a) Both assertion and reason are true and reason is the correct explanation of assertion.

(b) Both assertion and reason are true but reason is not the correct explanation of assertion. (c) Assertion is true but reason is false. (d) Both assertion and reason are false. 1. Assertion : Current stops flowing when Ecell = 0. Reason : Equilibrium of the cell reaction is attained. 2. Assertion : A standard hydrogen electrode is also called reversible electrode. Reason : It can act on both as anode as well as cathode in an electrochemical cell. 3. Assertion :Kohlrausch law helps to find the molar conductivity of weak electrolyte at infinite dilution. Reason : Molar conductivity of a weak electrolyte at infinite dilution cannot be determined experimentally. 4. Assertion : When a copper wire is dipped in silver nitrate solution, there is no change in the colour of the solution. Reason : Copper cannot displace silver from its salt solution. 5. Assertion : Fluorine is the best oxidising agent. Reason : Fluorine has highest reduction potential. Q3-A statement of assertion is followed by a statement of reason. Mark the correct choice from the options given below: (a) Both assertion and reason are true and reason is the correct explanation of assertion. (b) Both assertion and reason are true but reason is not the correct explanation of assertion. (c) Assertion is true but reason is false. (d) Both assertion and reason are false. 1. Assertion :Complex reaction takes place in different steps and the slowest step determines the rate of reaction. Reason : Order and molecularity of a reaction are always equal. 2. Assertion : Rate of reaction increases with increase in temperature. Reason : Number of effective collisions increases with increase in temperature. 3. Assertion : Order of a reaction with respect to any reactant or product can be zero, positive, negative and fractional. Reason : Rate of a reaction cannot decrease with increase in concentration of a reactant or product. 4. Assertion : The rate of a reaction sometimes does not depend on concentration. Reason : Lower the activation energy faster is the reaction. 5. Assertion : For a certain reaction, a large fraction of molecules has energy more than the threshold energy, still the rate of reaction is very slow. Reason : The colliding molecules must not be properly oriented for effective collisions. Q4-Learn all the lessons taught in class.

Q5-Complete all the worksheets posted in the group.



SUBJECT: PHYSICS

CLASS –XII

ELECTRIC FIELD AND CHARGE

SECTION A

Very short questions

1. What is coulomb law?

2. Define electric field. Write its unit and dimension.

3. Why do the electric field lines never cross each other?

4. Why must electrostatic field at the surface of a charge every point? Give reason.

5. Define dipole moment of an electric dipole. Is it a scalar quantity or a vector quantity?

6. Draw a plot showing the variation of electric field (E) with distance r due to a point

charge Q.

7. A proton is placed in a uniform electric field directed along the position X-axis. In

which direction will it tend to move?

SECTION-B

Short answer questions

1. Two point charges q1 and q2 are placed at a distance d apart as shown in the

figure. The electric field intensity is zero at the point P on the line joining them as

shown. Write two conclusions that you can draw from this.

2. In which orientation, a dipole placed in a uniform electric field is in (i) stable (ii)

unstable equilibrium?

3. A metallic sphere is placed in a uniform electric field as shown in the figure.

Which path is followed by electric field lines and why?

4. What is the electrostatic shielding ?how is this property used in actual practice? Is the

potential cavity in a charged conductor is zero?

5. Why is the potential inside a hollow spherical charged conductor constant and has

the same

value as on its surface?

6. Point out right or wrong for the following statement. The mutual forces between two

charges do not get affected by the presence of other charges.

7. A dipole of dipole moment p is present in a uniform electric field E . Write the value of

the angle between p and E for which the torque experienced by the dipole, is

minimum.

SECTION -C

Long answer questions

1.Two point charges having equal charges separated by lm distance experience a

force of 8 N. What will be the force experienced by them if they are held in water at

the same distance? (Given, Kwater = 80).

2.Two small identical dipoles AB and CD, each of dipole moment p are kept at an

angle of 120° as

shown in the figure. What is the resultant dipole moment of this combination? If this

system is subjected to electric field (E) directed along + X-direction, what will be the

magnitude and direction of the torque acting on this? [Delhi 2008]

3. A positive point charge (+ q) is kept in the vicinity of an uncharged conduction

plate. Sketch electric field lines originated from the point on to the surface Of the

plate.

4. Two point charges + q and -2q are placed at the vertices B and C of an equilateral

triangle ABC of side a as given in the figure. Obtain the expression for (i) the

magnitude and (ii) the direction of the resultant electric field at the vertex A due to

these two charges.

5.Two charged conducting spheres of radii a and b are connected to each other

by a wire. What is the ratio of electric fields at the surfaces of the two spheres.

Use the result obtained to explain why charge density on the sharp and pointed ends of a

conductors is higher than on its flatter portions?

SECTION-D

Multiple choice questions

1)Two charged spheres separated at a distance d exert a force F on each other. If they are

immersed in a liquid of dielectric constant 2, then what the force

a) F/2 b)F c)2F d) 4F

2) A charge q1 exerts some force on a second charge q2. If a third charge q3 is brought near

q2, the force exerted by q1 on q2

a) decreases b) increases c) remains same d)

increases if q3 is of same sign as q1 and decreases if q3 is of opposite sign

3)A metallic sphere having no net charge placed near a finite metal plate carrying a positive

charge. the electric force on the sphere will be

a) towards the plane b) away from the plane c) parallel to the plane d) zero

4)The torque acting on a dipole moment p in an electric field E is

a) P.E b) P ˣ E c) zero d) E ˣ P

5) Three charges are placed at the vertices of an equilateral triangle of side10cm.

Assume q1 =1 µC, q2 = 2 µC and q3 = 4 µC. work done in separating the charges to infinity is

a) 4.5 j b) 4.5 j c) 45 j d) none of these

6) The distance b/w the circular plates of a parallel plates of a parallel plate condenser 40

mm in a diameter, in order to have same capacity as a sphere of radius 1 m is

a) 0.01mm b) 0.1mm c) 1.0mm d) 10mm

7) The capacitance of a capacitor does not depend on

A) the medium b/w the plates b) the size of the plates

c) the changes on the plates d) the separation/w the plates

8) on increasing the plate separation of charged condenser, the energy

a) increases b) decreases c) remains unchanged d) become zero

9) Dielectric constant for metal is

a) zero b) infinite c)1 d) none of these

10) Flux coming out from a positive unit charge placed in air, is

a) ϵ0 b)1/ϵ0 c) 1/4πϵ0 d)4πϵ0

11) Draw the equipotential surface for a dipole.

12) If q is the positive b positive charge on each molecules of water, what is the total

positive charge in (360gm) a mug of water.

Chapter 2 Electric potential and capacitor

Section A

Very short questions

1. What is a capacitor.

2. What is electrostatic potential?

3. Write the formula for electric potential due to a dipole.

4.Calculate the potential at a point p due to charge for into 10 exponent - 7 coulomb

located at 9 CM away.5.

5 Potential energy is a vector or or scalar quantity ?

Section-b


1.Do free electrons travel to region of higher potential or lower potential? Give

reason

2.Can there be a potential difference between two adjacent conductors carrying the

same charge? Give reason

3.Can the potential function have a maximum or minimum in free space? Give reason

4.Prove that, if an insulated, uncharged conductor is placed near a charged

conductor and no other conductors are present, the uncharged body must be

intermediate in potential between that of the charged body and that of infinity.

5.Calculate potential energy of a point charge –q placed along the axis due to a

charge +Q uniformly distributed along a ring of radius R. Sketch P.E. as a function of

axial distance z from the centre of the ring. Looking at graph, can you see what would

happen if -q is displaced slightly from the centre of the ring (along the axis)?

6.Calculate potential on the axis of a ring due to charge Q uniformly distributed

along the ring of radius R.

Section c

Long questions

1 Find the equation of the equipotentials for an infinite cylinder of radius r0,

carrying charge of linear density λ.

2.Two point charges of magnitude +q and -q are placed at (-d/2, 0,0) and (d/2,

0,0), respectively. Find the equation of the equipotential surface where the

potential is zero.

3.A parallel plate capacitor is filled by a dielectric whose relative permittivity

varies with the applied voltage (U ) as ε = αU where α = 2V–1 .A similar

capacitor with no dielectric is charged to U0 = 78 V. It is then connected to the

uncharged capacitor with the dielectric. Find the final voltage on the

capacitors.

4.A capacitor is made of two circular plates of radius R each, separated by a

distance d< constant voltage. A thin conducting disc of radius r< thickness t<

the minimum voltage required to lift the disc if the mass of the disc is m.

5.a) In a quark model of elementary particles, a neutron is made of one up

quarks [charge (2/3) e] and two down quarks [charges –(1/3) e]. Assume that

they have a triangle configuration with side length of the order of 10–15 m.

Calculate electrostatic potential energy of neutron and compare it with its

mass 939 MeV.

(b) Repeat above exercise for a proton which is made of two up and one down

quark.

6Two metal spheres, one of radius R and the other of radius 2R, both have

same surface charge density σ . They are brought in contact and separated.

What will be new surface charge densities on them?

Section d


1A positively charged particle is released from rest in an uniform electric field.

The electric potential energy of the charge

(a) remains a constant because the electric field is uniform.

(b) increases because the charge moves along the electric field.

(c) decreases because the charge moves along the electric field.

(d) decreases because the charge moves opposite to the electric field

2.Equipotential surfaces

(a) are closer in regions of large electric fields compared to regions of lower electric fields.

(b) will be more crowded near sharp edges of a conductor.

(c) will be more crowded near regions of large charge densities.

(d) will always be equally spaced.

3.In a region of constant potential

(a) the electric field is uniform

(b) the electric field is zero

(c) there can be no charge inside the region.

(d) the electric field shall necessarily change if a charge is placed outside the region.

4.If a conductor has a potential V ≠ 0 and there are no charges anywhere else

outside, then

(a) there must be charges on the surface or inside itself.

(b) there cannot be any charge in the body of the conductor.

(c) there must be charges only on the surface.

(d) there must be charges inside the surface.

5.Equipotentials at a great distance from a collection of charges whose total sum is not zero

are approximately

(a) spheres.

(b) planes.

(c) paraboloids

(d) ellipsoids.

Chapter3

CURRENTELECTRICITY

SECTION A

Very short answer questions

1. Plot a graph showing variation of current versus voltage for the material GaAs.

2. Define the term electrical conductivity of a metallic wire. Write its SI unit.

3. Show variation of resistivity of Si with temperature in graph.

4. Write a relation between current and drift velocity of electrons in a conductor. Use

this relation to explain how the resistance of a conductor changes with the rise in

temperature?

5. Two wires of equal length, one of copper and the other of manganin have the same

resistance. Which wire is thicker?

6. Define the term electrical conductivity of a metallic wire. Write its SI unit.

7. Define ohms law.

8. What is drift velocity? Write its si unit and dimension.

SECTION-B


1. Two identical slabs, of a given metal, are joined together, in two different ways, as

shown in figures

(a) and (b). What is the ratio of the resistances of these two combinations?

2. Derive an expression forfor the current density of a conductor in terms of the drift

speed of electrons.

3. Calculate the steady current through the 2Ω resistor in the circuit shown in figure

4. Three resistors R1, R2 and R3 are connected in parallel, across a source of emf E and

negligible internal resistance. Obtain a formula for the equivalent expressions for the

current through each of the three resistors.

5.Define relaxation time of the free electrons drifting in a conductor. How it is related to the

drift velocity of free electrons? Use this relation to deduce the expression for the electrical

resistivity of the material.

6. Derive an expression for the resistivity of a good conductor, in terms of the relaxation

time of electrons.

7.Two metallic wires of the same material have the same length but cross-sectional area is

in the ratio 1: 2. They are connected

(i)in series and

(ii)in parallel.

Compare the drift velocities of electrons in the two wires in both the cases.

8.A resistance R is connected across a cell of emf E and internal resistance r. Now, a

potentiometer measures the potential difference between the terminals of the cells as V.

Write the expression for r in terms of E, V and R.

9.Three cells of emf E,2E and 5 E having internal resistances r, 2r and 3r, variable resistance

R as shown in the figure. Find the expression for the current. Plot a graph for variation of

current with R.

SECTION -C

Long answer questions

1.(i)State the principle of working of a potentiometer. (ii)Figure shows the circuit diagram of a potentiometer for determining the emf of E cell of negligible internal resistance.

(a)What is the purpose of using high resistance ? (b)How does the position of balance point (J) change when the resistance R1 is decreased? (c)Why cannot the balance point be obtained

when the emf E is greater than 2 V. when the key (K) is closed?

2.In the electric network shown in the figure, use Kirchhoff ‘s rules to calculate the power consumed by the resistance R =4Ω

3.Define the current sensitivity of a galvanometer. Write its SI unit. Figure shows two

circuits each having a galvanometer and a battery of 3 V. When the galvanometer in each

arrangement do not show any deflection, obtain the ratio R1 /R2.

4.Calculate the value of the resistance R in the circuit shown in the figure, so that the

current in the circuit is 0.2A. What would be the potential difference between points A and

B ?

5.(i) State Kirchhoff’s rules for an electric network. Using Kirchhoff’s rules, obtain the

balance condition in terms of the resistances of four arms of Wheatstone bridge.

SECTION-D


1) When the current flows through a conductor, then the order of drift velocity of electron

will be

a) 1010m/s b) 10ˉ2 cm/sec c) 104 cm/s d)10 ˉ1 cm/s

2) Conductivity increases in the order of

a) Al, Ag, Cu b) Al, Cu, Ag c) Cu, Al, Ag d) Ag, Cu, Al

3)A conductor carries a current of 0.2A. In 30 s how many electrons will flow through the

cross section of the conductor .

a) 0.375ˣ 1019 b) 375ˣ 1019 c) 3.75ˣ 1019 d) 37.5ˣ 1019

4)if an ammeter is joined in parallel in a circuit, it can be damaged due to excess

a) resistance b) current c) voltage d) none of these

5) Three resistances each of 4 ohm are connected in the form of an equilateral triangle. The

effective resistance b/w two corners is

a) 8 ohm b) 12 ohm c) 3/8 ohm d) 8/3 ohm

6) what is immaterial for electric fuse wire?

a) specific resistance b) its radius c) its length d) current flowing through it

7) Given three equal resistors, how many different combination of all the three resistors can

be made?

a) six b) five c) four d) three

8) Ratio of power developed across R,2R and 6R will be

a) 2:4:3 b) 1:2:6 c) 2:4:6 d) 1:2:3

9)The resistance of an ideal voltmeter is

a) low b) high c) infinite d) zero

10) With the help of circuit diagram, explain how a potentiometer can be used to compare

emf of two primary cells?

11) In a meter bridge , two unknown resistances Rand S when connected in the two gaps

,give a null point at 40 cm from one end. What is the ratio of R and S?



SUBJECT: BIOLOGY

CLASS –XII

,

Happy holidays students. Take care of your health ,have lots of water and fruits. Avoid junk

food. Stay at home and wash your hands frequently. Apart from all these you have to do the

following -:

1. Prepare an investigatory project report on any one topic out of the following – plastic

waste and its remedy/Maintenance of Aquarium/Down’s Syndrome/Infertility in

human/ IVF Technology/ Assisted Reproductive Technologies/Tissue Culture/ GM

plants and animals/ Vermicompositing /Organic Farming/Ecosyn toilets / Apiculture/

Amniocentesis/ Female Foeticide/ Conservation of Biodiversity/ Study of Human

Hematogy/ Bacillus thuringiensis/ Sexually transmitted diseases/Study of Ascariasis

in children.

Instructions:

i) The project report should be in printed form on A-4 size papers.

ii) The project report should be presented in the following order

a) Cover page showing title of the project, student information, name of school

and academic session.

b) Acknowledgement.

c) Chapters with relevant headings

d) Summary and conclusion based on findings

e) Bibliography

iii) Credit will be awarded to the drawings, pictures, llustrations and creative use of

materials

iv) All photographs and sketches should be labeled and acknowledged

2. Learn all the lessons taught in class.

3. Complete all the worksheets posted in the group.

“Stay safe and Healthy”

Enjoy the holiday with your Family

hermann gmeiner school, faridabad...2) write the decimal expansion of following numbers and say what...

Documents